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| Mirrors > Home > ILE Home > Th. List > 19.26 | GIF version | ||
| Description: Theorem 19.26 of [Margaris] p. 90. Also Theorem *10.22 of [WhiteheadRussell] p. 119. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 4-Jul-2014.) |
| Ref | Expression |
|---|---|
| 19.26 | ⊢ (∀𝑥(𝜑 ∧ 𝜓) ↔ (∀𝑥𝜑 ∧ ∀𝑥𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 109 | . . . 4 ⊢ ((𝜑 ∧ 𝜓) → 𝜑) | |
| 2 | 1 | alimi 1508 | . . 3 ⊢ (∀𝑥(𝜑 ∧ 𝜓) → ∀𝑥𝜑) |
| 3 | simpr 110 | . . . 4 ⊢ ((𝜑 ∧ 𝜓) → 𝜓) | |
| 4 | 3 | alimi 1508 | . . 3 ⊢ (∀𝑥(𝜑 ∧ 𝜓) → ∀𝑥𝜓) |
| 5 | 2, 4 | jca 306 | . 2 ⊢ (∀𝑥(𝜑 ∧ 𝜓) → (∀𝑥𝜑 ∧ ∀𝑥𝜓)) |
| 6 | id 19 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → (𝜑 ∧ 𝜓)) | |
| 7 | 6 | alanimi 1512 | . 2 ⊢ ((∀𝑥𝜑 ∧ ∀𝑥𝜓) → ∀𝑥(𝜑 ∧ 𝜓)) |
| 8 | 5, 7 | impbii 126 | 1 ⊢ (∀𝑥(𝜑 ∧ 𝜓) ↔ (∀𝑥𝜑 ∧ ∀𝑥𝜓)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∧ wa 104 ↔ wb 105 ∀wal 1400 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: 19.26-2 1535 19.26-3an 1536 albiim 1540 2albiim 1541 hband 1542 hban 1600 19.27h 1613 19.27 1614 19.28h 1615 19.28 1616 nford 1620 nfand 1621 equsexd 1782 equveli 1812 sbanv 1944 2eu4 2180 bm1.1 2223 r19.26m 2682 unss 3403 ralunb 3410 ssin 3453 intun 4001 intpr 4002 eqrelrel 4876 relop 4930 eqoprab2b 6146 dfer2 6808 omniwomnimkv 7507 als-no-surprise 17147 |
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